High performance burner

ABSTRACT

A high performance burner has a shell, a burning chamber contained in the shell, an ignition bar installed in the shell, and a fuel feeding means passing through the shell and being in communication with the burning chamber. The burning chamber has a first burning zone in communication with the exit of the feeding pipe, a second burning zone next to the first burning zone, and a third burning zone next to the second burning zone and in communication with the rear opening of the shell. The burner is able to effectively reduce fuel congestion, scorification and back fire and increase combustion efficiency.

CROSS-REFERENCE TO RELATED APPLICATIONS

Not Applicable

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not Applicable

INCORPORATION-BY-REFERENCE OF MATERIAL SUBMITTED ON A COMPACT DISC

Not Applicable

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a biomass fuel appliance, and more particularly, to a burner which is able to enhance a performance of biomass fuel ovens.

2. Description of Related Art

Utilizing biomass fuel such as straw, bits of wood, sand crop stalks, is a new resolution of energy. Appliance for using biomass fuel are being developed and improved day by day. The key component of a biomass fuel appliance is a burner thereof; which decides critical performance indexes such as energy utilization, safety, smoke, float dust, and scorification.

A burner for a biomass fuel oven is disclosed in a Chinese utility model application CN201903077 “A Burner” by the applicant. The burner has a burning chamber and a fuel feeding pipe. The burning chamber has a bottom and two side plates. The bottom is a level plane and the two side plates are parallel both having an angle of about 135 degree with respect to the bottom. An ignition bar slot is defined in the bottom. The ignition bar slot extends along a direction of movement of the biomass fuel. The fuel feeding pipe has a plurality of air vents defined therein, which air communicating a ventilation tank. The air vents basically up right with respect to a wall of the fuel feeding pipe.

It was found in actual use that the performance of the burner still has a room for improvement. First, a basic level bottom will form a great resistance for the movement of the fuel. The resistance may cause congestion of the fuel around an exit of the fuel feeding pipe. The congested fuel has insufficient air supply thus producing much more smoke and scorification. The congestion in front of the exit of the fuel feeding pipe may also cause accumulation of burning fuel, which brings risk of back fire. Second, a same air supply flow for both an upper stream primary burning zone and a lower stream secondary burning zone in the burning chamber has a problem. A flow suitable for the primary burning zone is overlarge for the secondary burning zone. The overlarge flow in the secondary burning zone may cause floating dust. Third, the upright air vents defined in the fuel feeding pipe are not good enough in term of preventing back fire. It is found in actual use that it is difficult for this structure to prevent back fire.

BRIEF SUMMARY OF THE INVENTION

The main object of the invention is to provide a high performance burner for use with a biomass fuel oven which makes a movement of the fuel smoother.

Another object of the invention is to provide a high performance burner for use with a biomass fuel oven which will not scorificate around an exit of a fuel feeding pipe of the oven.

Yet another object of the invention is to provide a high performance burner for use with a biomass fuel oven which supply a primary and secondary burning zones separately.

In order to accomplish the above objects, the present invention, provides a high performance burner has a shell, a burning chamber contained in the shell, an ignition bar installed in the shell, and a fuel feeding means passing through the shell and being in communication with the burning chamber. The shell has a bottom, a pair of side plates extending upward from the bottom, a top opening above the bottom, a front plate extending upward from the bottom, and a rear opening, opposite to the front plate. An ignition bar installation hole is defined respectively in each side plate. An air vent is defined in the front plate close to the bottom. The fuel feeding means has a feeding pipe passing through the front plate of the shell and a spiral shaft rotatably contained in the feeding pipe. A feeding window is defined in a wall of the feeding pipe sticking out from the shell. The feeding pipe has a fuel exit and at least one row of a plurality of air supply holes defined in the wall thereof within the shell, each air supply holes being oblique to the burning chamber. The burning chamber has a first burning zone in communication with the exit of the feeding pipe, a second burning zone next to the first burning zone, and a third burning zone next to the second burning zone and in communication with the rear opening of the shell. The first burning zone has a roughly level first bottom, a pair of oblique first side plates, a first front plate extending upward from the first bottom, and a first top opening opposite to the first bottom. The exit goes through the first front plate, making the feeding pipe be in communication with the first burning zone. A distance between the pair of first side plates is basically the same as a width of the exit at the exit and gradually increases along a direction from the first to the second burning zone. An ignition bar slot is defined in the first bottom up right with respect to the feeding pipe. At least one row of air curtain vents is defined in the first bottom between the ignition bar slot and the exit. The second burning zone has a second bottom obliquely extending downward from the first bottom and a second top opening opposite to the second bottom. The third burning zone has a third bottom a front upright plate extending from the third bottom to the second bottom, a rear upright plate extending from the third bottom to the bottom, and a third top opening opposite to the third bottom. A front top cover is formed between the front plat and the first front plate. A side top cover is formed respectively between each first side plate and each side plate of the same side. An air splitter is formed on the front plate extending inward into the shell. The air splitter has a level portion and a tilting portion. The level portion goes across the air vent, making an area of the air vent above the level portion be two times of the area below the level portion. A free end of the tilting portion points to a conjunction line between the first and the second bottoms. A wind shield is provided under the ignition bar, being formed on the first bottom and facing towards a direction of the air vent. A thermostable second side plate is provided on each of the two sides of the second burning zone. And, a deflector is formed on the first front plate above the exit.

These and other objectives, features, and advantages of the present invention will become apparent from the following detailed description, the accompanying drawings, and the appended claims.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a perspective view of the preferred embodiment of the burner of the invention.

FIG. 2 is another perspective view of the burner shown in FIG. 1.

FIG. 3 is an exploded perspective view of the burner shown in FIG. 1.

FIG. 4 is a side view of the burner shown in FIG. 1.

FIG. 5 is a cross-sectional view along the line A-A of FIG. 4.

FIG. 6 is a top view of the burner shown in FIG. 1.

FIG. 7 is a cross-sectional view along the line B-B of FIG. 6. And,

FIG. 8 is an enlarged view of the portion within circle C in FIG. 5.

DETAILED DESCRIPTION OF THE INVENTION

With reference to FIGS. 1, 2 and 3, the preferred embodiment of a high performance burner for use with a biomass fuel oven of the invention is shown. The burner has a shell 1, a burning chamber 2 contained in the shell 1, an ignition bar 3 installed in the shell 1, and a fuel feeding means 4 passing through the shell 1 and being in communication with the burning chamber 2.

The shell 1 has a bottom 10, a pair of side plates 11, 11″ extending upward from the bottom 10, a top opening 12 above the bottom 10, a front plate 13 extending upward from the bottom 10, and a rear opening 14 opposite to the front plate 13. An ignition bar installation hole 110, 110′ is defined respectively in each side plate 11, 11′. An air vent 130 is defined in the front plate 13 close to the bottom 10. An air pipe of an air blower (not shown) is able to be connected to the air vent 130 and supply air into the shell 1.

Further with reference to FIGS. 5 and 7, the fuel feeding means 4 has a feeding pipe 40 passing through the front plate 13 of the shell 1 and a spiral shall 41 rotatably contained in the feeding pipe 40. A feeding window 42 is defined in a wall of the feeding pipe 40 sticking out from the shell 1. The feeding pipe 40 has a fuel exit 43 and at least one row of a plurality of air supply holes 44 defined in the wall thereof within the shell 1. Particularly refer to FIG. 8, each air supply holes 44 is oblique to the burning, chamber 2. A diameter of each air supply holes 44 may be from 3 to 5 millimeter, preferably 3.5 millimeter. Two rows of air supply holes 44 are defined in the feeding pipe 40 in this preferred embodiment. Each row may have 10 to 20 air supply holes 44 in quantity, preferably 16. A diameter of the feeding pipe 40 may be from 80 to 100 millimeter, preferably 90 millimeter.

Further with reference to FIG. 7, the burning chamber 2 has a first burning zone 21 in communication with the exit 43 of the feeding pipe 40, a second burning zone 22 next to the first burning zone 21, and a third burning zone 23 next to the second burning zone 22 and in communication with the rear opening 14 of the shell 1. The first burning zone 21 has a roughly level first bottom 211, a pair of oblique first side plates 212, 212′, a first front plate 213 extending upward from the first bottom 211, and a first top opening 214 opposite to the first bottom 211. The exit 43 goes through the first front plate 213, making the feeding pipe 40 be in communication with the first burning zone 21. A distance between the pair of first side plates 212, 212′ is basically the same as a width of the exit 43 at the exit 43 and gradually increases along a direction from the first to the second burning zone 21, 22. A length of the first bottom 211 from the exit 43 to the second burning zone 22 may be from 80 to 150 millimeter, preferably 120 millimeter. With reference to FIG. 5 together, an ignition bar slot 215 is defined in the first bottom 211 up right with respect to the feeding pipe 40 in a distance of from 20 to 40 millimeter, preferably 25 millimeter, to the exit 43. A width of the ignition bar slot 215 is about 10 millimeter, and a length thereof is between the pair of first side plates 212, 212′. At least one row of air curtain vents 216 is defined in the first bottom 211 between the ignition bar slot 215 and the exit 43.

The second burning zone 22 has a second bottom 221 obliquely extending downward from the first bottom 211 and a second top opening 222 opposite to the second bottom 221. An oblique angle of the second bottom 221 with respective to the first bottom 211 may be 8 to 30 degree, preferably 17 degree. The third burning zone 23 has a third bottom 231, a front upright plate 232 extending from the third bottom 231 to the second bottom 221, a rear upright plate 233 extending from the third bottom 231 to the bottom 10, and a third top opening 234 opposite to the third bottom 231. A length of the second bottom 221 from the first bottom 211 to the front upright plate 232 may be 60 to 130 millimeter, preferably 100 millimeter. A height of the front upright plate 232 may be 80 to 150 millimeter, preferably 120 millimeter. A length of the third bottom 231 from the front to the rear upright plates 232, 233 may be 80 to 150 millimeter, preferably 120 millimeter. Widths of the second bottom 221, the third bottom 231, the front upright plate 232 and the rear upright plate 233 may be from 80 to 120 millimeter, preferably 100 millimeter. The first, the second, and the third top openings 214, 222, 234 together define a flame opening. A plurality of air supply openings 217 are defined in the first bottom 211 between the ignition bar slot 215 and the second bottom 221, in the second bottom 221, and in the third bottom 231. A diameter of the air supply openings 217 may be from 2 to 4 millimeter, preferably 3.5 millimeter.

A front top cover 15 is formed between the front plate 13 and the first front plate 213. A side top cover 16, 16′ is formed respectively between each first side plate 212, 212′ and each side plate 11, 11′ of the same side. A bellow 17 is defined by an enclosure of the bottom 10, side plates 11, 11′, the front plate 13, the front top cover 15, the side top covers 16, 16′ of the shell 1 and the first front plate 213, the first side plates 212, 212′, the first bottom 211, the second bottom 221 and the third bottom 231 of the burning chamber 2. An air splitter 18 is formed on the front plate 13 extending inward into the shell 1. The air splitter 18 has a level portion 181 and a tilting portion 182. The level portion goes across the air vent 130, making an area of the an vent 130 above the level portion 181 be two times of the area below the level portion 181. A free end of the tilting portion points to a conjunction line between the first and the second bottoms 211, 221.

A wind shield 30 may be provided under the ignition bar 3, being formed on the first bottom 211 and facing towards a direction of the an vent 130. The wind shield 30 is able to prevent a strong wind from the air vent 130 to affect igniting. A rear top cover 19 may be provided on the shell 1 above the third top opening 234, which is able to deflect a heat in the third burning zone 23 to the second and the first burning zones 22, 21 to increase heat utilization ratio. Since a temperature in the second burning zone 22 is usually high, a thermostable second side plate 223, 223′ may be provided on each of the two sides of the second burning zone 22 to prevent distortion of the shell 1 of this portion under high temperature. The second side plates 223, 223′ may be of ceramic or stainless steel. A deflector 218 is formed on the first front plate 213 above the exit 43 in order to prevent accumulation of the fuel in this area and enhance a safety of the burner.

In use, a user is able to turn on an electric power of the oven having the burner. Biomass fuel granule falls into the fuel feeding pipe 40 from a hopper through the feeding window 42 under the gravity (all elements not shown in Figs.). The fuel enters the first burning zone 21 over the exit 43, driven by the spiral shaft 41, and drop down on the first bottom 211. At this time, the ignition bar 3 has been electrified and turned hot and will ignite the fuel falling thereon. The air blower supplies air to the bellow 17 via the air vent 130. Air above the air splitter 18 enters the burning, chamber 2 mainly through the air supply holes 44, the air curtain vents 216 and the air supply openings 217 in the first bottom 211. Air below the air splitter 18 enters the burning chamber 2 mainly through the air supply openings 217 in the second and the third bottom 221, 231. The air entering the burning chamber 2 through the air supply holes 44 and the air curtain vents 216 forms a strong wind curtain, which is able to prevent burning of the fuel in the feeding pipe 40, i.e., to prevent back fire. Compared with conventional air supply holes up right with respect to the wall of the feeding pipe, wind entering into the feeding pipe through opposite air supply holes will not directly conflict any longer. Without the direct conflict which will result in great loss, of flow speed, a strong wind shield will be able to be formed. A capability of the burner to prevent back fire is able to be significantly increased. Furthermore, since the distance between the two first side plates 212, 212′ at the exit 43 is basically the same as the width of the exit 43, compared with conventional parallel side plates, there will not be corners at conjunctions between the exit 43 and each side plate at which the fuel is not liable to be pushed to move forward by incoming fuel. Burning efficiency is thus increased and possibility of scorification lowered. And the gradual increase of the width between the two first side plates 212, 212′ from the first to the second burning zones 21, 22 is effectively decrease a friction between the moving fuel and the side plates 212, 212′ compared to the conventional parallel side plates. The fuel congestion is relieved and the burning efficiency and scorification are further improved.

The fuel having burned in the first burning zone 21 only needs a relatively short time and a small amount of air for burning to release most remaining energy. The downward oblique second bottom 221 is able to both relieve the congestion of fuel in the first burning zone 21 caused by the fuel in the second burning zone 22, and accelerate the forward movement of the fuel in the second burning zone 22. The burning efficiency and scorification are yet further improved. The fuel having burned in the second burning zone 22 still has a small amount of energy for burning. When the fuel falls upon the third bottom 231 under the gravity, the remaining energy is able to give up in the third burning zone 23. At the same time, ash in the third burning zone 23 will not affect burning in the first and the second burning zone 21, 22. The burning efficiency and scorification are able to be extremely improved. Since the existence of the air splitter 18, about ⅔ of the air flow is used to supply for the air supply holes 44, air curtain vents 216 and the first burning zone 21, which need strong wind and a large amount of oxygen supply and only about ⅓ of the air flow is used to supply for the second and the third burning zones 22, 23, which needs only a small amount of oxygen supply. The floating dust caused by superfluous air supply in the rear burning zone and the insufficient combustion caused by inadequate air supply in the front burning zone in the conventional even air supply type oven is thus being avoided. The deflector 218 is able to effectively press down the accumulation of the fuel frequently occurred in the first burning zone 21 and will be able to reduce the risk of the burner.

From above description, it is seen that the objects of the present invention have been fully and effectively accomplished. Embodiment of the invention has been shown and described for the purposes of illustrating the functional and structural principles of the present invention and is subject to change without departure from the invention's principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims. 

1. A high performance burner comprising: a shell, a burning chamber contained in said shell, an ignition bar installed in said shell, and a fuel feeding means passing through said shell and being in communication with said burning chamber, said shell having a bottom, a pair of side plates extending upward from said bottom, a top opening above said bottom, a front plate extending upward from said bottom, and a rear opening opposite to said front plate, an ignition bar installation hole being defined respectively in each side plate, an air vent being defined in said front plate close to said bottom, said fuel feeding means having a feeding pipe passing through said front plate of said shell and a spiral shaft rotatably contained in said feeding pipe, a feeding window being defined in a wall of said feeding pipe sticking out from said shell, said feeding pipe having a fuel exit and at least one row of a plurality of air supply holes defined in said wall thereof within said shell, each air supply holes being oblique to said burning chamber, said burning chamber having a first burning zone in communication with said exit of said feeding pipe, a second burning zone next to said first burning zone, and a third burning zone next to said second burning zone and in communication with said rear opening of said shell, said first burning zone having a roughly level first bottom, a pair of oblique first side plates, a first front plate extending upward from said first bottom, and a first top opening opposite to said first bottom, said exit going through said first front plate, making said feeding pipe be in communication with said first burning zone, a distance between said pair of first side plates being basically the same a width of said exit at said exit and gradually increasing along a direction from said first to said second burning zone, an ignition bar slot being defined in said first bottom up right with respect to said feeding pipe, at least one row of air curtain vents being defined in said first bottom between said ignition bar slot and said exit, said second burning zone having a second bottom obliquely extending downward from said first bottom and a second top opening opposite to said second bottom, said third burning zone having a third bottom, a front upright plate extending from said third bottom to said, second bottom, a rear upright plate extending from said third bottom to said bottom, and a third top opening opposite to said third bottom, a front top cover being, formed between said front plate and said first front plate, a side top cover being formed respectively between each first side plate and each side plate of the same side, an air splitter being formed on said front plate extending inward into said shell, said air splitter having a level portion and a tilting portion, said level portion going across said air vent, making an area of said air vent above said level portion be two times of said area below said level portion, a free end of said tilting portion points to a conjunction line between said first and said second bottoms, a wind shield under said ignition bar, being formed on said first bottom and facing towards a direction of said air vent, a thermostable second side plate on each of said two sides of said second burning zone, and, a deflector being formed on said first front plate above said exit.
 2. The high performance burner as claimed in claim 1, wherein a diameter of each air supply holes is from 3 to 5 millimeters, each row has from 10 to 20 air supply holes, a diameter of said feeding pipe is from 80 to 100 millimeter, a length of said first bottom from said exit to said second burning zone is from 80 to 150 millimeter, a distance between said ignition bar slot and said exit is from 20 to 40 millimeter, an oblique angle of said second bottom with respective to said first bottom is from 8 to 30 degree, a length of said second bottom from said first bottom to said front upright plate is from 60 to 130 millimeter, a height of said front upright plate is from 80 to 150 millimeter, a length of said third bottom from said front to said rear upright plates is from 80 to 150 millimeter, widths of said second bottom, said third bottom, said front upright plate and said rear upright plate are from 80 to 120 millimeter, and, a diameter of said air supply openings is from 2 to 4 millimeter.
 3. The high performance burner as claimed in claim 2, wherein said diameter of each air supply holes is 3.5 millimeter, each row has 16 air supply holes, said diameter of said feeding pipe is 90 millimeter, said length of said first bottom from said exit to said second burning zone is 120 millimeter, said distance between said ignition bar slot and said exit is 25 millimeter, said oblique angle of said second bottom with respective to said first bottom is 17 degree, said length of said second bottom from said first bottom to said front upright plate is 100 millimeter, said height of said front upright plate is 120 millimeter, said length of said third bottom from said front to said rear upright plates is 120 millimeter, widths of said second bottom, said third bottom, said front upright plate and said rear upright plate are 100 millimeter, and, said diameter of said air supply openings is 3.5 millimeter. 